Gd^19+离子双电子复合速率系数的理论研究  

Theoretical studies of dielectronic recombination rate coefficients for Rh-like Gd ions

作　　者：符彦飙 魏二龙[1,2] 田瑞 马德全 FU Yan-biao;WEI Er-long;TIAN Rui;MA De-quan(Key Laboratory of Atomic and Molecular Physics&Functional Materials of Gansu Province, College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,Gansu,China;Joint Laboratory of Atomic and Molecular Physics,Northwest Normal University and Institute of Modern Physics of Chinese Academy of Sciences,Lanzhou 730070,Gansu,China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃省原子分子物理与功能材料重点实验室,甘肃兰州730070 [2]西北师范大学与中科院近代物理研究所极端环境原子分子物理实验室,甘肃兰州730070

出　　处：《西北师范大学学报（自然科学版）》2018年第5期37-43,共7页Journal of Northwest Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(11464043).

摘　　要：基于全相对论组态相互作用理论,详细计算了类铑钆离子的双电子复合(DR)速率系数;研究分析了内壳层电子激发、辐射通道和级联退激对DR速率系数的影响,以及DR速率系数随高n电子轨道角动量的变化.结果表明,内壳层4p电子激发以及级联退激对DR速率系数的贡献不可忽略.对双电子复合、辐射复合以及三体复合速率系数做了比较,在温度大于1eV时,双电子复合速率系数都大于辐射复合和三体复合速率系数,相应的DR过程对于等离子体离化态分布和能级布居以及光谱模拟都极为重要.同时,对基态和第一激发态的DR速率系数进行了参数拟合.Dielectronic recombination(DR)rate coefficients of complex ions are very important in some application research,such as extreme ultraviolet lithography and nuclear fusion.Theoretical calculations are made for dielectronic recombination rate coefficients of Gd 19+ions using a flexible relativistic atomic code.Influence of inner-shell electron excitation,radiative channels,the effect of decays to autoionizing levels possibly followed by radiative cascades(DAC)and orbital angular momentum of high n electron on DR rate coefficient are analyzed.The contributions of 4p electron excitation and DAC can not be neglected.The total DR rate coefficient is greater than either the radiative recombination or three-body recombination coefficients for electron temperatures greater than 1 eV.The total DR rate coefficients for the ground state and the first excited state are fitted to an empirical formula.These results should be useful for further analyses of DR process for Gd 19+and other complex structures ions.

关 键 词：双电子复合 速率系数 DAC效应 

分 类 号：O562.5[理学—原子与分子物理]